Related Experiment Video
Updated: Apr 24, 2026

Catheter-based Endovascular Angioplasty for Fibrosing Mediastinitis-associated Pulmonary Vein Stenosis
Published on: August 26, 2025
A mycotic forearm pseudoaneurym as an unusual complication of infective endocarditis
Gonçalo M Rodrigues1, Carlos Oliveira Amaral, Hugo Dias Valentim
1Departmento de Angiologia e Cirurgia Vascular do Hospital de Santa Marta, Centro Hospitalar de Lisboa Central, Lisboa, Portugal.
Introduction:
Mycotic pseudoaneurysms are an infrequent complication of infective endocarditis; most cases are secondary to arterial trauma. The commonest site involved are the intracranial arteries, followed by the abdominal aorta and then the peripheral vessels.
Case Presentation:
We report a case of a 36-year-old man, admitted in our institution for a subarachnoid haemorrhage, who presented with fever of unknown origin during his stay in the neurocritical care unit and whom was diagnosed infective endocarditis due to Meticilin Sensible Staphylococcus Aureus. Almost two weeks after antibiotic therapy was instituted, he presented a large, growing, pulsatile mass of the left forearm. A giant pseudoaneurysm arising from the radial artery was detected with ultrasound and surgical intervention was carried out. A large laceration of the radial artery was detected and an interposition of a vein graft was performed.
Discussion:
Forearm mycotic pseudoaneurysms are rare. A high index of suspicion is needed and they should always be borne in mind in the differential diagnosis of an extremity pain, swelling or motor-sensorial deficit after infective endocarditis.
Insights
Mycotic pseudoaneurysms, rare complications of infective endocarditis, can occur in the forearm. Early diagnosis and surgical intervention are crucial for managing these vascular emergencies.
Area of Science:
- Vascular Surgery
- Infectious Diseases
- Radiology
Background:
- Mycotic pseudoaneurysms are rare complications of infective endocarditis.
- Intracranial arteries are most commonly affected, followed by the aorta and peripheral vessels.
Observation:
- A 36-year-old man with subarachnoid hemorrhage developed fever and was diagnosed with infective endocarditis (Staphylococcus Aureus).
- He later presented with a large, pulsatile left forearm mass.
- Ultrasound revealed a giant pseudoaneurysm of the radial artery.
Findings:
- Surgical intervention identified a large radial artery laceration.
- A vein graft interposition was performed to repair the artery.
Implications:
- Forearm mycotic pseudoaneurysms are rare but require a high index of suspicion.
- Consider these in the differential diagnosis of extremity pain, swelling, or neurological deficits post-infective endocarditis.
Related Concept Videos
Endocarditis II: Clinical Features of Infective Endocarditis
Endocarditis I: Introduction
Endocarditis III: Medical Management
Endocarditis IV: Nursing Management
Myocarditis I: Introduction
Aneurysm III: Interprofessional Care